Soft top is lowered (opens)
WARNING: This page is about a different car, the 2001 Saab 9-3. However, it is still accessible from the selected car via links, so may be relevant.
When the fifth bow reaches the center position, the STC control module sends VR -bus message "Hydraulic valve 4 ON" and when hydraulic valve 4 is activated, pressure is connected from the pump to pressure to the cylinders, the pistons are pulled in and start lowering (opening) of the soft top. When the fifth bow has passed the center position, the STC control module sends VR -bus message "Hydraulic valve 1 OFF" and the fifth bow slides into position in the soft top storage.